LT3461/LT3461A 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT FEATURES DESCRIPTION n Integrated Schottky Rectifier The LT 3461/LT3461A are general purpose fixed frequency n Fixed Frequency 1.3MHz/3MHz Operation current mode step-up DC/DC converters. Both devices n High Output Voltage: Up to 38V feature an integrated Schottky and a low V switch al- CESAT n Low V Switch: 260mV at 250mA lowing a small converter footprint and lower parts cost. The CESAT n 12V at 70mA from 5V Input LT3461 switches at 1.3MHz while the LT3461A switches n 5V at 115mA from 3.3V Input at 3MHz. These high switching frequencies enable the use n Wide Input Range: 2.5V to 16V of tiny, low cost and low height capacitors and inductors. n Uses Small Surface Mount Components The constant switching frequency results in predictable n Low Shutdown Current: <1A output noise that is easy to filter, and the inductor based n Soft-Start topology ensures an input free from switching noise typi- n Low Profile (1mm) SOT-23 (ThinSOT) Package cally present with charge pump solutions. The high voltage switch in the LT3461/LT3461A is rated at 40V making the device ideal for boost converters up to 38V. APPLICATIONS The LT3461/LT3461A are available in a low profile (1mm) n Digital Cameras SOT-23 package. n CCD Bias Supply L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n XDSL Power Supply ThinSOT is a trademark of Linear Technology Corporation. n TFT-LCD Bias Supply n Local 5V or 12V Supply n Medical Diagnostic Equipment n Battery Backup TYPICAL APPLICATION 5V to 12V, 70mA Step-Up DC/DC Converter Efficiency 85 L1 10H V IN 5V 80 1 V = 5V IN V SW OUT 6 5 V V 12V C1 IN OUT 75 70mA 1F V = 3.3V LT3461A IN 261k 15pF 4 3 OFF ON SHDN FB GND 70 C2 2 30.1k 1F 65 3461 TA01a 60 0 20 60 80 40 LOAD CURRENT (mA) 3461 TAO1b 3461afa 1 For more information www.linear.com/LT3461 EFFICIENCY (%)LT3461/LT3461A ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Input Voltage (V ) ....................................................16V IN SW 1 6 V IN V , SW Voltage ......................................................40V OUT GND 2 5 V OUT FB Voltage ...................................................................5V FB 3 4 SHDN SHDN Voltage ...........................................................16V S6 PACKAGE Operating Ambient 6-LEAD PLASTIC TSOT-23 T = 125C, = 150C ON BOARD OVER Temperature Range (Note 2) ....................40C to 85C JMAX JA GROUND PLANE, = 120C/W JC Maximum Junction Temperature .......................... 125C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3461AES6 PBF LT3461AES6 TRPBF LTAHG 8-Lead Plastic TSOT-23 40C to 85C LT3461ES6 PBF LT3461ES6 TRPBF LTAEB 8-Lead Plastic TSOT-23 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: